ITEM NAME:1X(20 Series T Nuts M3/ M4/ M5 T Slot Nut Hammer Head Fastener Nut AssortmeO4D4) 1X(20 Series T Nuts M3/ M4/ M5 T Slot Nut Hammer Head Fastener Nut AssortmeO4D4) 1X(T slot nut assortment set: There are 3 different sizes of T slot nut in this set from which you can use for different purposes. Reliable performance: The t-nut assortment is made of carbon steel with rust-resistant, sturdy and durable in use. Convenient grid storage box: Each size of T slot nut is stored in an individual compartment of the storage box, convenient and quick to pick up the size you needs. Usage: T-nuts are suitable for 20 series aluminum profile, widely applied for building industrial aluminum frame structures, 3D printers, CNC routers, robotics projects. Material: carbon steel Head Style: hammer head Sizes: M3, M4, M5 Color: silver Package includes: 50* M3 T-Nuts 50* M4 T-Nuts 50* M5 T-Nuts 1* Transparent plastic box)