The Bosch Drilling Keyed Drill Chuck UNF Silver/Black is a drill chuck keyed ratcheting for easy bit changes. The cutting quality depends on the correct speed and the coolant used. The drill chuck keyed is made from high-quality cast iron enables the use of standard non-impact drills in an SDS drill. These keyed chucks from Bosch have 1/4in (6.3mm) hexagonal shanks and SDS-plus keyless chuck is 1.5 - 13mm which can be drilled in right-hand and left-hand direction only. Bosch is a leading manufac