Specification： Made Of High Quality Casting Steel For Long Life And Increased Durability. All Parts Heat Treated. 7/16" T-Slot, 3/8"-16 Stud Size, & 1" Step Block Width (All Standard) Contains (24) Studs- (4) Each Of 3", 4", 5", 6", 7", & 8" Long Also Contains (4) Coupling Nuts, (6) Forged Steel Step Clamps (2 Each Based On Stud Sets), (12) Steel Step Blocks, (6) Flange Nuts, (6) T-Nuts, & Wall Holder Product Description: Low cost,Highest cost performance Brand New & High Quality Durable Good after-sales service Package Include： 58*Pack Clamping Kit W/o Product Instruction .