Starrett A2 Arbor for Hole Saws - 5/8-18 ~ HSS Pilot Bit - 7/16" Hex Shank Mora Knives It also has a tri-square

It also has a tri-square sleeve

Standard 3/4" driving hex head for use with wrenches or sockets

A very popular saw with customers

By cutting on a push stroke

The blade also can be removed when/if needed to be replaced

Starrett A2 Arbor for Hole Saws - 5/8-18 ~ HSS Pilot Bit - 7/16" Hex Shank Mora Knives It also has a tri-squareStarrett Model No. A2 High Speed Steel Pilot Bit 1 4" size Designed for Hole Saw sizes: 1 1 4" to 8 9 32" 7 16" shank size For 1 2" chuck capacity size Quick hitch arbor, allowing instant change of hole saw without tools & without removing the arbor from the chuck Product Description Specs This Starrett Hole Saw Arbor is supplied with 1 4" pilot drill (6. 35mm). 7 16" shank size (11 mm). Screw thread 5 8" 18. HSS Pilot Bit. For 1 2" chuck capacity