The draper 19 piece 20mm metric vortex socket set is manufactured from chrome vanadium steel that is hardened tempered chrome plated and polished for corrosion protection the unique hollow socket technology of the draper expert vortex ratchet and sockets is ideal for long fixings the sockets are edge driven allowing a fixing to pass through the head and avoid the depth restriction of conventional sockets and ratchets packed in a blow mould carrying case