Siegen WallDrive Socket 16mm Deep 1/2" Square Drive Individual Socket S0672. Cold-forged Chrome Vanadium steel sockets. Hardened and tempered for added strength. Chrome plated and mirror finished. WallDrive socket configuration. LIFETIME GUARANTEE FROM A REPUTABLE UK COMPANY – Founded in 1978, Sealey is a large family run business with a vast product range. Trusted by professionals, all Sealey products are thoroughly tested and backed by unrivalled aftersales service.