- 281mm 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 Z-Axis on all models. Made from A2 Stainless Steel, it provides reliable linear motion and long-lasting performance. Key Features Direct Replacement: Sized to replace Z-Axis lead screw on the WorkBee CNC Machine. Stainless Steel: Strong, corrosion-resistant construction for long-term durability.