The Irwin Phillips insert screwdriver bits are engineered for use in hand-driving applications or with power tools. They are designed for use in an insert holder with C-clip for retaining ring notch. The bits are compact and versatile with a 1/4 inch hex body and made from high grade S2 Steel with a titanium coating.

The Irwin IRW10504334 Screwdriver Phillips bits come in a bag of 10 with the following dimensions:
PH2 x 25mm