Chrome Screw Chrome screw fitting castors, sold in sets of four. Available in the follow sizes. 1″ 1/8 [28.5mm] 1″ 1/4 [32mm] Measurement is taken from the internal width of the cup and/or the diameter of the wheel. Category: Castors & Glides Related products Chrome Socket View product Brass Screw, Brown Wheel View product Brass Round Cup Fitting View product Polypropylene Castors View product