Cast iron ball cabinet knobs are a classic round knob with a burnished and lacquered finish. Minimalistic door knobs for your kitchen cupboards and drawers. The cupboard knobs are available in two sizes and co-ordinate with our Burnished Cup Pulls. The cast iron ball cabinet knob measurements can be found in the PDF drawing in Dimensions. Material: Solid Cast Iron. Finish: Burnished. Style: Ball Cabinet Knobs. Size: 27mm & 33mm. Sold singly. Supplied with x2 rear fixing screws 47mm & 25mm.