Standard duty swivel plate caster with brake. Full 1-1/4″ (32mm) tread width. Heavy gauge .150″ (4mm) mounting plate provided. Mounting Plate with hole openings spaced on 1-3/4″ x 3″ (44mm x 76mm) centers to accept 1/4″ or 5/16″ (6mm x 8mm) dia. bolts.