Package includes:40 x T Slot Bolts Hammer Head size: 10 x 6 x 3.5mm; Thread Diameter: 5mm (M5), Bolt length 20mm. Notice: When purchasing, please confirm the size of your aluminum profile or T-groove to ensure that it matches the size of our T-bolt. Edge Products 31104 Juice with Attitude CTS Monitor Synrise T Screw Stud Drop-in Bolt T-Bolt for 40 Series Standard T-Slot... M5 x 10mm Metric Thread T Slot,Drop-in Stud Sliding T-Bolt,Hammer For detailed dimensions, please see the detailed information above. Advantage: Carbon steel T screw bolt screws nuts surface chrome finish, quenching and tempering heat treatment, not easy corrosion, and high-hardness. Application: Used widely for aluminum alloy, rack assembly and clamping lock, used with T-nuts, good fastening effect. T-type screws design for aluminium extrusions, suitable for standard 6mm T-Slot 20mm aluminum extrusions and most of the other brands 20mm aluminium profile T Bolts M5 Drop-In T-Bolts Hammer Head Bolt Screw - 20 Series Profile T Slot Bolts