EASY & QUICK INSTALLATION PROCESS Easy setup with the recommended bore dimensions (1" depth x 3/8" width for 1/4" 20; 1 9/16" depth single / 2" width for 3/8" 16), simply strike fastener with included instrument to ensure secure stretch fixation, beginner friendly operation DURABLE 304 STAINLESS STEEL CONSTRUCTION: made of durable 304 stainless steel substance, these fasteners resist oxidation and maintain strong holding power with good abrasion resistance, suitable for indoor and outdoor applications, including humid environments Choice in two sizes for adaptability: this concrete fixing collection includes two size variants: 50 pieces 1/4"-20 threaded inserts or 30 pieces 3/8"-16 threaded inserts, each with a hand-operated installation tool Wide Application Compatibility Provides firm attachment in concrete, masonry and stone substrates and is perfect for fixing handrails, shelves, support brackets and lighting units Practical placement tool Package includes: each package contains a special hand-operated placement instrument that allows immediate use without additional equipment and is ideal for household improvement projects and professional installations with time-saving results, Manufacturer: OSNIYAW