Kit Contains: 1 Step Block and Clamp Kit which includes: 6 Step Blocks. 6 Serrated End Clamp. 1 T-Nut and Stud Kit which includes: 4 Coupling Nuts. 4 Flange Nuts. 4 T-Slot Nuts. 1 T-Slot Cleaner. 24 studs - 4 each of 80, 110, 150, 175, 200, & 250mm long. 1 Holder (wooden base and metal tray). 25mm Wide