TECHNICAL SPECIFICATION: Metal. The PRECOIL Prewinder / Rotary Helicoil insertion tool is designed for low volume users of PRECOIL Tangless and Tanged Coil-thread inserts (Helicoil Inserts). The all-steel contruction of the PRECOIL Insertion tool makes them sturdy and dependable. The Helicoil Insertion tool or Thread repair Insert tool is designed with precision and durability in mind for manual installation of thread repair inserts (Helicoil inserts). Customers installing hundreds or thousands of thread repair inserts per month should consider using the Electric or Air tool for a significant boost in productivity and reduced labor costs. For more details log-on to www.samsindusneeds.com. HSN CODE: 82034090