The Draper 19 Piece 20mm Metric Vortex Socket Set is manufactured from chrome vanadium steel that is hardened, tempered, chrome plated & polished for corrosion protection. The unique hollow socket technology of the Draper Expert VORTEX ratchet & sockets is ideal for long fixings. The sockets are edge driven, allowing a fixing to pass through the head & avoid the depth restriction of conventional sockets & ratchets. Packed in a blow mould carrying case.