Flat wire staples are especially suitable for thin materials when the back of the staple should not press into the material being stapled. Fine wire staples are the universal staple for numerous hand and DIY applications. Narrow-back staples penetrate deeply, providing a particularly tight fit with low-impact staple backs. Bosch staple nails are made of high-carbon steel wire with pin lengths between 14 and 30 mm. Head width is either 1.8 or 2.8 mm, depending on the tool. Suitable for Black & Decker tacker. 2.8 x 1.65 x 14 mm.