1/4" HSS Sheeters Double End Drill Bit, Drill America. Double end drills are used for drilling truck and auto bodies, or any thin sheet metal. Popular for pop rivet applications. 135 Degree self-centering split point aids in penetration '-- While we are happy to sell this product in any quantity you desire, we prefer this item be purchased in multiples of 12 in order to not break product packaging.