10 set Contractor Pack (only $7.49 per pair) 100# load rating, medium duty slides. Ideal use is in Office furniture, Cabinets, Closets, Kitchen Accessories, & Medical furniture. These zinc finished GlideRite slides are made of high-grade steel meets or exceeds all BIFMA, BHMA, and ANSI standards for quality and have a lifetime replacement limited warranty. Actual Size: length 550mm (21-5/8 inches), width 45.5mm (1-3/4 inches), thickness is 12.7mm (1/2 inch). For Face Frame installation you will need rear mounting face frame brackets, Just search: GlideRite SK70. Factory sealed contractor pack includes slides and instructions only, no screws. #8 x 1/2-inch pan head screws are recommended.