Phillips no.1 x slotted 3/16" bit fits 1/4" hex socket of doubled ended shaft. Phillips no.2 x slotted 1/4" bit fits in opposite 5/16" hex socket end. 6-In-1 Multi-Bit Screwdriver Phillips no.1 x slotted 3/16" bit fits 1/4" hex socket of doubled ended shaft Phillips no.2 x slotted 1/4" bit fits in opposite 5/16" hex so