11 sizes: M4*8, M4*10, M5*10, M6*8, M6*10, M6*13, M6*15, M8*15, M8*20, M10*15, M10*25 . Different sizes can meet your different needs. Threaded wood inserts are used for pre-embedded connectors, wood furniture. Standard hexagon socket head, smooth and flat, features flanged thread texture, stable structure and easy installation. The nut thread surface is smooth without burrs and the screw sleeve can be screwed on quickly. Precise external thread and beveled inner hex head so that the clamping nut is correctly placed and firmly installed. just drill the appropriate size hole and install it with a hex key, the tapered outer threads make it hard to fall off due to vibration. Suitable for soft wood such as pine, plywood, fiberboard , etc. (a small hole must be drilled before installation). Features: These insert nuts are made from high quantity zinc alloy and comes in a resealable transparent plastic box. Screw-in insert nuts have an external thread and can be screwed in with a hex key wrench. This set of screw-in insert nuts come in different sizes and take different screw sizes. Widely used in the installation of mechanical fastener industry, furniture, etc. 230pcs insert nuts are enough for using. Content:(Size/PCS) M4*8 /30pcs M4*10/60pcs M5*10/45pcs M6*8 /18pcs M6*10/32pcs M6*13/13pcs M6*15/12pcs M8*15/10pcs M8*20/5pcs M10*15/3pcs M10*25/2pcs Specifications: Quantity: 230pcs Material: Zinc alloy Type: Hex socket screw-in Product weight: 390g Box size: 17.3 x 9.8 x 2.3cm. Package Includes:230pcs x Insert Nuts Note: 1.Please allow 1-3mm difference due to manual measurement. 2.Due to light and screen difference, the item's color may be slightly different from the pictures.