Megapro 9BP-CG-2A Replacement Bit Packs, FD2-4, FD3-5 Replacement bit set Use with the HVAC driver made in the USA Store easily in the patented pullout bit cartridge Made of S2 steel for durability Can be used with any drill that has a 1/4-Inch quick change chuck Replacement bit pack Use with the HVAC driver made in the USA Store easily in the patented pullout bit cartridge Made of S2 steel for durability Can be used with any drill that has a 1/4-Inch quick change chuck Made in the USA