Bosch chuck keyless 14in hex shank bosch 2608572212 these keyless chucks from bosch have 14in 63mm hexagonal shanks keyless chuck with adaptor 15 13 mm sds plus suitable for gbh 2 26 dfr gbh 3 28 dfr gbh 4 32 dfr gbh 36 vf li professional bosch 2608572212 chuck keyless 15 to 13mm sds pro bosch rotary hammer adaptor