This is a depth gauge collar for a Craftsman 8in 3 speed (620-1300-3100 rpms) 1/2 in chuck, cast Iron Base with 45 deg Tilt Bed.
The part number and model number weren't available, but this is a direct copy of the drill depth gauge collar. It has been beefed up in the out ring for more strength to hold to the quill boss. It comes complete with bolt and Nylock Nut.
There is a 1.545" diameter quill mount. The offset is 0.726" from mounting edge to center hole of the gauge rod. The hole is 0.250" with a 3/8" - or 10 mm socket for the nut. The thickness is 0.342".
