A pulley block is a kind of professional hoisting tool, is a necessary mechanism composed of a wheel on an axle or shaft. Using stainless steel and nylon materials, it is sturdy and durable for long servicing time, can be used for boat, rope, cord and so on, bring you convenience and satisfy your needs. Features - Color: Black. - Material: Stainless steel, nylon. - Size: 9.80X5.20X2.00cm /3.85X2.04X0.79inch. - Made of stainless steel and nylon material, these pulleys are anti-rust and wear-resistance. - Pulley rotation cylinder head is sturdy and durable, can rotate to the degree you need. - Designed for use with rope or cord in indoor and outdoor applications, very professional and practical. - High load plain bearing, stable working performance, bring you a lot of convenience. - Mainly applied in boat, seagoing vessel, driving fitness boat. Perfect for sportsman, hunting, boating, shop, and more uses.Packing list: 1 x sailboat pulley