GP50 RotoZip 50-Pack Drywall Router Bits Guide Point 1/8” GP50 RotoZip 50-Pack Drywall Router Bits Guide Point 1/8” is an all purpose guide-point bits that trace around outlet boxed and can light for fast accurate drywall cutouts and won’t damage receptacle boxes because it is rounded to follow the outline without cutting through. GP50 RotoZip 50-Pack Drywall Router Bits Guide Point 1/8” has a diameter and collet sized of 1/8” and a cut depth of 3/4”.