Handle Bi-material; Precise adjustment by profiled adjusting wheel; Forged steel of chrome vanadium; Available in five sizes: 150 mm (6 ''), 200 mm (8 ''), 250 mm (10 ''), 300 mm (12 ''), 375 mm (15 ''); Compliant with ISO 6787 / DIN 3117 / ASME B 107.8M.