Chip relief reduces the torque needed to install them

You can think of them as a precision cutting tool that you use just once

so they always go in straight

Hopper Angle Capacity (level full) Dimensions PSPB-20 45 deg  20cf  44" x 44" x 32" PSPB-30  45 deg  30cf  44" x 44 x 42" PSPB-40  45 deg  40cf  44" x 44 x 52" PSPB-50  45 deg  50cf  44" x 44 x 62" PSPB-60  45 deg  60cf  44" x 44 x 72" PSPB6-25 60 deg  24cf 44" x 44 x 46" PSPB6-35 60 deg  36cf 44" x 44 x 56" PSPB6-45 60 deg  43cf 44" x 44 x 64" PSPB6-55 60 deg  54cf 44" x 44 x 74" PSPB6-65 60 deg 63cf 44" x 44 x 84"

Reparación Permanente de Roscas en Barreno Ciego (Pulgadas) C-Sert Chip relief reduces the torque*INCLUDES INSTALL TOOLING AND CUTTING FLUID. View Selection Chart The patented C Sert system gives you quick and permanent repair of damaged threads, and prevents damage to OEM threads. C Serts' main characteristics are: 1) Self tapping C Serts require no tap because they are a tap. You can think of them as a precision cutting tool that you use just once, and that ends up staying in the part to provide you with new, permanent threads. 2) Self aligning