CMT 850.603.11 T-Slot Bit 1-7/64" x 17/32" 7/16" S=1/2" ABA Adjustable Post Base 41-X10 is a Up/Downcut Spiral

41-X10 is a Up/Downcut Spiral Router Bit

and what does it protect against

Model Number: HD5B

Shank Parallel shank (5/16 or 1/2 inch)

Ultra Finish Wood Cutting

CMT 850.603.11 T-Slot Bit 1-7/64" x 17/32" 7/16" S=1/2" ABA Adjustable Post Base 41-X10 is a Up/Downcut SpiralThe CMT 850. 603. 11 is a Keyhole Bit T Slot Bit. Keyhole and T slot bits create hanging slots for wall mounting of picture frames, mirrors, shelves, and plaques. SPECIFICATIONS Diameter (D) 1 7 64" Small Diameter (d) 11mm Cutting Height (I) 17 32" Total Length (L) 2 7 32" Shank (S) 1 2" Number of Teeth 2 Product Type Keyhole Bit T Slot Bit Shank 1 2" Blade Material Carbide Tipped (TCT) Rotation Right hand (RH) Country of Origin Made in Italy