Lead Screw Length: 300mm, Lead Screw diameter: 8mm, Lead Screw spacing: 2mm. Design: T8 Brass Nut, a brass nut which can be used to fix machines with 4 holes. It is designed to work with most machine heads that have a 4-hole configuration. Material: 304 Stainless steel lead screw + Brass Nut, anti-rust, durable to use. Application: Suitable for 3D Printer, stepper motor, machine tools, and other equipment. QWORK