Manufactured to surpass the performance test BS2558: 1954. The sockets locate directly onto the handle relieving stress on the rivet. All sockets are plated, hardened and stress relieved to ensure they retain their shape. Scaffold Key Manufactured with a hook end and cranked taper square podger end for aligning and tightening eyebolts, jacking collars and loop fixings, both ends are hardened and tempered to improve tool life. Overall length: 305mm. Bar diameter: 15mm. Head width: 20mm.