Powerbuilt 10mm x 12mm Extra Long Double Ring Spanner Smooth Finish GROZ DRILL CHUCK ARBOR MT1 GROZ DRILL CHUCK ARBOR MT1 33JT Morse Taper 1 Jacobs Taper 33 Drill Chuck Arbors are used to mount a drill chuck or any other tool which has a female taper shank onto a machine such as a drilling machine which has a female taper shank socket in its workhead 256 Pieces Replacement Packs Available Part # Size Pack Qty C1860 1 1 8 x 3 4 15 C1860 2 1 8 x 1 1 4 15 C1860 3 5 32 x 3 4 15 C1860 4 5 32 x 1 1 4 15 C1860 5 3 16 x 3 4 15 C1860 6 3 16 x 1 15 C1860 7 3 16 x 1 1 2 15 C1860 8 1 4 x 1 10 C1860 9 1 4 x 1 1 2 8 C1860 10 1 4 x 2 5 C1860 11 1 8 Nuts 30 C1860 12 5 32 Nuts 30 C1860 13 3 16 Nuts 45 C1860 14 1 4 Nuts 23 Chrome vanadium steel fully polished