The Jaw (OEM Part No. 3128310378) is a mechanical spare component compatible with Simba M4C, Simba E7C, Simba H1354, SIMBA H1254, underground drilling rigs. Manufactured from durable alloy steel, it is designed for the rock drill assembly jaw position. The jaw provides reliable gripping and positioning support within the drilling mechanism, ensuring stable component operation. Its strong construction delivers accurate fitting, high load resistance, and long service life in harsh underground mining environments. This OEM replacement jaw helps maintain drilling equipment performance and operational reliability.