ITEM NAME:1/2-inch Steel T-Slot Nut Black Oxide Plated Grade 8.8 Tapped Through 5pcs E4K5 1/2-inch Steel T-Slot Nut Black Oxide Plated Grade 8.8 Tapped Through 5pcs E4K5 Black oxide finish, pressing thread forming and durable. Bottom of T-Slot Nut Is staked to prevent the stud from protrusion. It is used for T-slot aluminum extrusions to connect other parts. Undersized to fit machine table slot case hardened. Hardness: 23-32HRC Product Name: T Slot Nut Main Color: Black Material: 45# Steel Grade: 8.8 Weight: 199g Dimension: 24 x 24 x 15mm/0.94-inch x 0.94-inch x 0.6-inch(L*W*H) Thread Diameter: 1/2-inch Slot Width: 14mm / 11/20-inch Coating: Black Oxide Plated Slot Depth: 7mm / 7/25-inch Package Content: 5pcs x T Slot Nut Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Black oxide finish, pressing thread forming and durable. Coating: Black Oxide Plated. Bottom of T-Slot Nut Is staked to prevent the stud from protrusion. Undersized to fit machine table slot case hardened.