This 17mm Draper Expert HI-TORQ® metric ratchet combination spanner is 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 this spanner ideal for use where there’s limited space. The ring end is 12-point HI-TORQ®, providing a superior grip; with Draper HI-TORQ®, the spanner grips 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.