Craftsman 46133 Bolt-On 20V Max Lithium Ion Drill/Driver 35% more power compared to Bolt On Model 16496 This Model replaces Bolt On Model 16496 20 Volt Max Cordless Power Unit with Drill/Driver Attachment 20 Volt Max Lithium Ion Battery, Charger, (1) Double-Ended Bit Variable Speed (0-800 RPM) Chuck Size 3/8"