With just a push on and a twist, the TOWER Power Glo-Starter’s patented head-locking design offers exceptional attachment ease that’s also more secure than spring-loaded plungers, letting you deliver 1500mAh of dependable power at virtually any angle. Its stainless steel shaft and beryllium copper electrodes last for years of use. Choose from Short and Long shaft lengths, with vinyl tip caps to prevent shorts and fouling. Both are available with or without a built-in meter in the cap that lets you see that your glow plug is drawing current. All four come with a convenient AC charger for overnight charging.