Material: Aluminum Alloy Treatment: Black oxidation. Item Size: 45*34*17mm Weight: 60g Compatible with Ender 3/CR10 series,Tornado 3d printers; This lead screw bearing holder will help eliminate Z axis wobble ,and improve the print accuracy; Durable and easy to install. Package List: 1pc Z-Axis Lead screw Top Mount 2pcs M4 T Nuts 2pcs M4x14mm screws