Brass Screw Fitting Polished brass screw plate castors, sold in sets of four. Available in the follow sizes. 1″ [25mm] 1″ 1/8 [28.5mm] 1″ 1/4 [32mm] 1″ 1/2 [38mm] Measurement is taken from the diameter of the wheel. Category: Castors & Glides Related products Brass Socket View product Brass Screw, White Wheel View product Chrome Screw View product Polypropylene Castors View product