Irwin 4935076 Percussion Straight Bit Set, 6", 5Pc/Pk Wall Repair Compounds Fits into 4" flange and

Fits into 4" flange and then allows 3" SCH

or concrete block

T-style head minimizes the nail head size for easier concealment

a hardwood backer block and an assortment of grommets

no spill pipe joint compound

Irwin 4935076 Percussion Straight Bit Set, 6", 5Pc/Pk Wall Repair Compounds Fits into 4" flange andHighlights: Bit Type: Rotary Drill Bit Size: Assorted Product Type: Percussion Bit Set Dril Bit Length: 6 in. Shank Type: Straight Application: Use with all types of impact and rotary drivers Packaging Type: Clamshell Material: Carbide Tipped Patented carbide tip controlled self centering when starting holes Patented flute design for rapid dust removal reduces clogging and increases penetration speed Short drill head forces drilling dust into flute