5/8" Diameter x 5/16" Pilot Drill Hole Type M Counterbore 3/8" Shank

WL Fuller Type M Counterbore

Designed to cut clean holes in wood and plastic. Can also be used with stop collars. Counterbores for the flat under the heads of nails, spikes, and bolts. Allowing them to be sunk far enough beneath the surface to allow for a wood plug to be used to cover the head. Can be set at any point on a twist drill and held fast with two hex-socket set screws. Designed for clean cutting.

• Made of Carbon Steel.
• Have a 3” overall length and are designed for deep counterboring.
• Can also be used with drill jig bushings.

Made in USA