Faithfull heavy-Duty keyed chuck for use on both Rotary and Impact drills. Fitted with an anti-thrust bearing to increase the amount of grip and to prevent slipping when under load. Designed in accordance to DIN 6349 The FAICHUCK12 comes complete with key and adaptor for use with SDS and SDS Plus machines. When used with SDS machines, the drill MUST NOT be used in hammer mode 1/2in x 20 UNF thread. Capacity 13mm Complete with chuck key.