These heavy-duty staples are designed for safe and secure installation of NM (Romex®) cable gauges 14/3, 14/3G, 12/3 and other wire up to 19/32-Inch (15 mm) in width. For exclusive use with Klein's Loose Cable Stapler (Cat. No. 450-100). These UL listed insulated staples are available in packs of 300. Features: Staples secure flat and round Voice, Data, Video and NM (Romex®) nonmetallic sheathed cable; For NM (Romex®) cable gauges 14/3, 14/3G, 12/3 and other wire up to 19/32-Inch (15 mm) in width; Fits Klein Tools Loose Cable Stapler (Cat. No. 450-100); UL listed insulated staples; Special coating increases holding power; Pack of 300 staples; Available in other staple sizes; Romex® is a registered trademark of Southwire Company; Insulated to Protect Cable Jacket from Damage; For NM (Romex®) cable gauges such as 14/3, 14/3G, 12/3 and other wire up to 11/32-Inch x 19/32-Inch (9 mm x 15 mm) in size; Fit Klein Tools Loose Cable Stapler (Cat. No. 450-100) exclusively; UL listed insulated staples are designed with plastic insulation to protect cable; Available in other staple sizes from Klein Tools; Not compatible with other brands of staplers; Made in USA; Fit Klein Tools Loose Cable Staplers (Cat. Nos. 450-01 and 450-100) exclusively - Warnings: Always wear approved eye protection and hearing protection.; Read instructions before using.; Never work on or near live electric circuits.; For professional use only.; Always be cautious of potential hazards such as electrical wiring, damp or wet conditions, unstable surfaces.; Read instructions before using. Not compatible with other brands of staplers.