Chrome vanadium steel. Converts ratchet spanners into ratchets. Includes: 1/4″ square drive adaptor with 10mm spanner fitting; 3/8″ square drive adaptor with 13mm spanner fitting; and 1/2″ square drive adaptor with 19mm spanner fitting. Push-button locking mechanism. Chrome vanadium steel. Converts ratchet spanners into ratchets. Includes: 1/4″ square drive adaptor with 10mm spanner fitting; 3/8″ square drive adaptor with 13mm spanner fitting; and 1/2″ square drive adaptor with 19mm spanner fitting. Push-button locking mechanism.