- 557mm WorkBee Replacement TR8x8-2P Lead Screw is a ready to use replacement lead screw for the WorkBee CNC Machine. Supplied at the correct length, it fits the 500x500mm model. Made from A2 Stainless Steel, it provides reliable linear motion and long-lasting performance. Key Features Direct Replacement: Sized to replace any 500mm axis lead screw on the WorkBee CNC Machine. Correct Length: Sized for installation on the 500x500mm WorkBee machine. Stainless Steel: Strong, corrosion-resistant construction for long-term durability.