This is versatile plastic pulley mounted on a table clamp so that it can be adjusted in different angles. Mounts on the edge of any force table or regular table up to 20 millimeters thick. Diameter of pulley is 50 mm (2 inches) and the sheave grove is wide enough for nylon strings, mason line and standard 2-mm pulley string (See product code NYLON30M). 
String for pulley clamp is available in two different sizes. Only the 2-mm string or narrower is good for this pulley..