Use mineral spirits, enamel reducer, or kerosene to purge system after using. Heavy Duty Anti-Rust and Rubberized Undercoating can be thinned with mineral spirits for improved spraying if needed.

The Unibit drill makes a clean perfectly round 1/2" hole.

Always follow all instructions and warnings and wear proper eye, ear, skin and respiratory protection. When using chemicals always consult MSDS and product data sheets for proper safety precautions. Use the pk of 25 Plastic Plugs (16004) to plug the holes.

This specially designed drill bit easily makes neat distortion free 1/2" holes so these areas can be effectively rust-proofed. Does not require a pilot hole. This stepped drill features a single straight cut flute to prevent grabbing thin sheet metal. Drilling to a depth of only 1/2" produces a neat 1/2" hole.