These 3/4 extension slides have a 100 pound static and 75 pound dynamic load rating. They have a smooth roll and a self closing feature (slides have a parallel drop of 3/32"). The synthetic rollers are on tempered steel axles. Requires 1/2" clearance on each side. Available from 12" to 22", standard price is for 22" slides. Actual slide size is 1/4" less than stated size, i.e. 22" is actually 21 3/4". Price is for a pair of slides consisting of one set left and one set right cabinet and drawer members. No mounting hardware is included.