Pocket Holes... Twice as Fast! The DK3100 is the only pocket hole machine on the market that has the ability to drill two pocket holes in one machine cycle across rails of varying widths. Drill spindles in the machine are fixed at 3/4", 1" and 1-3/4" on center allowing it to drill today's most common rail widths of 1-1/2" up to 3-3/4" in one machine cycle. Three step drill bits are utilized in the machine, one of which is left-handed. Like all Kreg machines, the DK3100 features the ability to center a screw in 1/2" to 1-1/2" thick material, hardened steel drill guides that maximize drill bit life and minimize bit deflection, swing stops that ease material positioning with both rails and panels, and a one-touch foot pedal that fires the triple spindle drill head in a lightening quick one second.