WL Fuller Four-Flute Type "C" Countersink
WL Fuller Four-Flute Type "C" Countersink
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Made in the USA · W.L. Fuller
- Made of carbon steel & heat-treated for long tool life
- For use in all woods, plastics, & non-ferrous metals
- 82° cutting angle head
- Four flutes for clean & accurate boring
- Two hex-socket set screws in countersink
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A high quality American-made countersink made by WL Fuller. Made of carbon steel & heat-treated, this countersink is very well-built, durable, & cuts into materials well. This type “C” countersink is designed for use in all woods, plastics, & non-ferrous metals. It has four flutes for clean & accurate boring, & a standard 82° cutting angle which will accommodate most bevelled screws. The countersink is held in place with two hex-socket set screws fastened into the bit & is easily adjustable up & down the length of the drill bit if the need arises. This countersink can be mounted on taper point, brad point & regular point drills. A very popular item with our customers. Made in the USA.
The W.L. Fuller Co. is a family owned, third generation manufacturer of the best countersinks, counterbores, plug cutters, taper point drills, brad point drills, & step drills. All made 100% in the U.S.A. today. With over 60 years experience manufacturing tools to cut woods, plastics, & metals, Fuller provides tools you need to get the job done while saving you time & money. All of their products carry their “satisfaction guarantee”.
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Model Cutting Diameter Drill Hole Size Length #C2 1/4" 5/64" 3/4" #C3 1/4" 3/32 3/4" #C4 5/16" 7/64" 7/8" #C44 5/16" 1/8" 7/8" #C65 5/16" 9/64" 7/8" #C410 5/16" 5/32" 7/8" #C411 5/16" 11/64" 7/8" #C43 5/16" 3/16" 7/8" #C56 3/8" 3/32" 7/8" #C57 3/8" 7/64" 7/8" #C5 3/8" 1/8" 7/8" #C6 3/8" 9/64" 7/8" #C7 3/8" 5/32" 7/8" #C8 3/8" 11/64" 7/8" #C9 3/8" 3/16" 7/8" #C913 3/8" 13/64" 7/8" #C97 3/8" 7/32" 7/8" #C105 7/16" 5/32" 7/8" #C1011 7/16" 11/64" 7/8" #C103 7/16" 3/16" 7/8" #C10 7/16" 13/64" 7/8" #C1014 7/16" 7/32" 7/8" #C104 7/16" 1/4" 7/8" #C122 1/2" 1/8" 7/8" #C129 1/2" 9/64" 7/8" #C125 1/2" 5/32" 7/8" #C1211 1/2" 11/64" 7/8" #C92 1/2" 3/16" 7/8" #C102 1/2" 13/64" 7/8" #C12 1/2" 7/32" 7/8" #C1415 1/2" 15/64" 7/8" #C14 1/2" 1/4" 7/8" #C145 5/8" 5/32" 1-1/16" #C143 5/8" 3/16" 1-1/16" #C167 5/8" 7/32" 1-1/16" #C16 5/8" 1/4" 1-1/16" #C1617 5/8" 17/64" 1-1/16" #C169 5/8" 9/32" 1-1/16" #C1619 5/8" 19/64" 1-1/16" #C18 5/8" 5/16" 1-1/16" #C243 3/4" 3/16" 1-1/8" #C247 3/4" 7/32" 1-1/8" #C244 3/4" 1/4" 1-1/8" #C245 3/4" 5/16" 1-1/8" #C20 3/4" 21/64" 1-1/8" #C24 3/4" 3/8" 1-1/4" #C284 7/8" 1/4" 1-1/4" #C285 7/8" 5/16" 1-1/4" #C286 7/8" 3/8" 1-1/4" #C287 7/8" 7/16" 1-3/8" #C324 1" 1/4" 1-3/8" #C326 1" 3/8" 1-3/8" #C328 1" 1/2" 1-1/2" - Customer Reviews5.0 Based on 6 Reviews5 ★100%64 ★0%03 ★0%02 ★0%01 ★0%0Customer Photos
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Be the first to review this itemFilter Reviews:×Clear filterMore FiltersGS09/21/2023George S.United States
Fuller parts
Great experience got one wrong part they made it right and new part out fast will from them anytime I need something
#C65 ~ 5/16" Cutting Diameter - 9/64" Drill Hole SizeTM01/15/2023Teddy M.United States
WL Fuller
WL Fuller's are top of the line drill bits and countersinks. I prefer them above all other types. Also, Hardwick & Sons provides excellent service.
#C5 ~ 3/8" Cutting Diameter - 1/8" Drill Hole SizeKR02/27/2022Kyle R.United States
Made in USA original
Nice countersinks with good machining, sharp, works as it should
#C6 ~ 3/8" Cutting Diameter - 9/64" Drill Hole SizeKK07/01/2021Ken K.United States
U guys are the best thanks
#C24 ~ 3/4" Cutting Diameter - 3/8" Drill Hole SizeJB10/01/2020john b.United States
Hardwick's
Perfect! Hardwick's is the real deal. Been a tradition in Seattle (and me) for the 35 plus years I have shopped there. Fuller countersinks are my industry standard for fine tools.
#C913 ~ 3/8" Cutting Diameter - 13/64" Drill Hole Size
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- Reviews
- Questions
Thank you for submitting a review!
Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Fuller parts
Great experience got one wrong part they made it right and new part out fast will from them anytime I need something

WL Fuller
WL Fuller's are top of the line drill bits and countersinks. I prefer them above all other types. Also, Hardwick & Sons provides excellent service.

Made in USA original
Nice countersinks with good machining, sharp, works as it should

U guys are the best thanks

Hardwick's
Perfect! Hardwick's is the real deal. Been a tradition in Seattle (and me) for the 35 plus years I have shopped there. Fuller countersinks are my industry standard for fine tools.