These HI-TORQ metric ratchet combination spanners are manufactured from hardened and tempered chrome vanadium steel, with black electroplating for corrosion protection. The 100-tooth ratchet enables 3.6 movement and the open end is set at 15, making these spanners ideal for use where theres limited space. The ring end is 12-point HI-TORQ, providing a superior grip; with Draper HI-TORQ, the spanners grip the flats of the fastener rather than the corners. This gives more grip while transmitting more torque to the nut or bolt and prevents damage to the corners by spreading the load across the flats. The spanners are available individually and in sets, which come supplied in a useful storage/carry rack.