Pin Vise and drill index sized from 0.0135" to 0.039" (0.34 to 1mm)

The drill index has drills sized from 0.0135" to 0.039" (0.34 to 1 mm). These are useful tools for enlarging the inner diameter of fused silica adapters, or for clearing a fused silica tube that has broken off in a through-type union.