Bosch chuck keyless 14in hex shank bosch 2608572150 these keyless chucks from bosch have 14in 63mm hexagonal shanks keyless chuck matt chrome plated 15 13 mm 12 20 suitable for gsb 20 2 gsb 20 2 rce gsb 20 2 re gsb 20 2 ret gsb 21 2 re professional psb 850 psb 1000 psb 1200 bosch 2608572150 chuck keyless 15 to 13mm 12in x 20 unf chrome plated