The Craftsman 510 features a wider transition module to accommodate wider/larger cartridges. 

Details:

• Features a protected, cartridge drop-in design
• Fits most 510 thread cartridges 
• Powered by a high-quality 300mAh lithium-ion rechargeable battery core
• 3-LEDs indicate battery life and power settings
• Four (4) power/voltage settings (2.4V, 2.8V, 3.2V, 3.6V)
• USB magnetic charging port + cable
• Compatible with Base Charger (Not included)
• Dimensions: 4.3"L x 0.5"D