The JORGENSEN 150 mm Woodworking Clamps 4-Pack is a set of hand-powered workholding devices perfect for woodworking projects. These black and orange clamps are made of durable plastic, featuring a 6-inch size that is splicable to a 400 mm ratchet bar for added versatility. The set includes 4 clamps, each designed with a clamp head style for easy use in various woodworking applications. Manufactured by Hangzhou Great Star Industrial Co., LTD in China, these clamps do not require batteries and come in a convenient set for all your woodworking needs.