Adapts standard drill bits for use with 1/4-28 threaded drills. Includes both collet and collet adapter. Overall of length of 1.125". #21 wire drill size.
Spring back dimple dies are precision CNC machined from aircraft quality heat treatable stainless steel & heat treated to Rockwell C42/46 (tensile 190,000 psi). Spring back angles on both dies make a superior dimple.
Carbide tipped for durability making it great for composite work. 1/4” x 28 male thread. Requires 1500P pilot. There is a 3/32" pilot hole and 100 degrees.