Handy, ergonomic wire stapler that does not sacrifice power. Compact design and precision make it easy to use one-handed. Simple loading mechanism and release make loading staples as easy as pushing a button. Visual refill window shows user if staples are loaded. Grooved guide ensures consistent stapling. Quality plastic housing with steel components provide a lightweight, yet durable stapler. Great for household and professional wiring projects (low voltage wire up to 1/4'). Uses round crown T25 staples in three sizes: 3/8', 7/16', 9/16'.