The ICSN-633 Shim Seat is a precision replacement insert seat designed for indexable turning and boring toolholders that use 80° diamond (CNMG-style) carbide inserts. Manufactured from hardened, wear-resistant material, it provides a stable seating surface that ensures accurate insert positioning, improves cutting performance, and protects the toolholder pocket from wear. The ICSN-633 features a 3/4" inscribed circle (IC), 3/16" thickness, and 3/64" corner radius, making it ideal for heavy-duty machining and production environments. Compatible with a wide range of turning and boring toolholders.