Faithfull Chuck is heavy-duty and suitable for use on Rotary and Impact Drills. The chuck features an anti-thrust bearing which provides additional grip and also prevents slipping when under load. The chuck has a quality construction for strength and durability. This Faithfull Chuck has a 13mm capacity with 1/2in x 20 UNF thread and is supplied with a Key and SDS Adaptor for use with SDS and SDS Plus machines.