Draper expert 19 piece 20mm metric vortex socket set draper expert 40197 b i expert quality i b socket set manufactured from chrome vanadium steel 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 this allows a fixing to pass through the head and avoid the depth restriction of conventional sockets and ratchets packed in blow