Drill Stop Collar Set G4021 Citgo Quenchol 521 is a

Citgo Quenchol 521 is a highly stable quench oils designed especially for use in steel heat treating operations

Smooth running ball bearing

Produces a high luster finish on all types of precious and decorative metals

Burr King or Bader III Grinders

False top edge of 1" and nicely tapered blade make the Chukar a blade you will want to add to your collection

Drill Stop Collar Set G4021 Citgo Quenchol 521 is aTakes the guess work out of drilling! Simply slip the collar over drill bit; measure desired depth; then tighten set screw. Will drill to uniform depth every time. Steel collars will not slip like plastic stops. Slotted screws tighten into flute. Rust Proof plated finish. 7pc. set with one collar to fit these drill sizes: 1 8, 3 16, 1 4, 5 16, 3 8, 7 16, 1 2.