Centering Head, Compatible Threader Grainger Part Number 1AC02, 1VXG8, 3Z987, 4CPC4, Compatible Threader Manufacturer Part Number 15682, 15722, 41855, 41935, 93287, Compatible Threader Series 300, Product Type Centering Head, Fits Brand Ridgid, For Use With 300 Compact Pipe and Bolt Threading Machine, 300/300A Power Drive, 535 Manual Pipe and Bolt Threading Machine, 535 Pipe and Bolt Threading Machine, Impact Rated No