Specifications:<br><br> Model Runner Diameter Wheel Width Rotating Ring Width Total Length Max Load<br> M15 15mm 6mm 11mm 62mm 35kg<br> M20 20mm 7mm 13mm 75mm 75kg<br> M25 25mm 10mm 15mm 84mm 150kg<br> M32 32mm 11mm 15mm 94mm 250kg<br> M50 50mm 13mm 20mm 130mm 400kg<br><br> Note: <br> The max load weight is a Theoretical value, we cannot guarantee the pulley can achieved the max load,but these pulleys were standard made.<br> Manual measurement, please allow 1-2mm error.<br><br> A Crane Pulley Block is a kind of hoisting tool, also called a sheave, is a mechanism composed of a wheel on an axle or shaft that may have a groove between two flanges around its circumference.<br> A rope, cable, belt, or chain usually runs over the wheel and inside the groove, if present.<br> Pulleys are used to change the direction of an applied force, transmit rotational motion, or realize a mechanical advantage in either a linear or rotational system of motion.<br><br> Function: Designed for hanging weight things to lighten load.<br> Advantage: Durable, strong, reliable, waterproof, anti-rust, anti-high temperature, corrosion resistance.<br> Applications: Widely used in tractive effort of steel wire rope or other rope tools.<br><br> Type: Single Pulley Block<br> Material: 304 Stainless Steel<br> Size: M20, fit for rope within 7mm.<br> Color: Silver Tone<br> Package: 2pcs