M20 20mm 1" Stainless Steel 304 Double Wheel Swivel Snatch Pulley Block Double Sheave Material: Stainless Steel 304 Stainless steel wheel Dia: 20mm /0.787" Stainless steel wheel Width: 8mm /0.315" eye Dia: 13mm /0.512" Total Height: 73mm /2.87"