12v, 3/8", maximum, cordless lithium-ion drill/driver impact driver combo kit, 12v, 3/8" maximum features 2 speed transmission for optimal speed & torque control, 0-400, 0-1,500 & led light provides visibility in dark areas, 12v max 1/4" impact driver features 3 led lights to provide visibility without shadows & 1 handed loading, 1/4" hex chuck accepts 1" bit tips, kit includes: two 12v max lithium-ion batteries, fast charger, 2 belt hooks & contractor bag.