Drilled mild Steel Ball Brand: WKM Features: Best Price, Best Quality & Fast Delivery. 1 Inch MIld Steel Ball With hole and hook Removable Hook Part Number: KT49 Details: 1" Drilled mild steel ball - can be used for collision and pendulum demonstrations. Steel Ball can be used for hobbies and various other things. Approx 2.5mm drilled hole with hook and hook is removable. Package Dimensions: 1.2 x 0.8 x 0.4 inches