5/16-18 x 2-1/2" Black Steel Carriage Bolts, 304 Stainless Steel 18-8, Round Domed Head Square Neck Carriage Bolts Screws, Coarse Thread UNC, 10 PCS

5/16-18 x 2-1/2" Black Steel Carriage Bolts, 304 Stainless Steel 18-8, Round Domed Head Square Neck Carriage Bolts Screws, Coarse Thread UNC, 10 PCS

• Package Includes: 5/16-18 x 2-1/2" Black Carrigae Bolts 10 pcs
• Design feature: Big round domed head designed to eliminate the need for a washer; Square neck underneath the head helps self locking; Their strong holding power ensures the stability and reliability of your contructions; Use wrench or plier tools to turn the square neck to install them
• Material: Made of 304 Stainless Steel with black coating outside which is superior to regular stainless steel fasterners, provides better strength and corrosion resistance in bad environments like high temperature, cold weather and high humidity areas without the need for time consuming and costly maintenance
• Screw Length: 2.5 inch (measured from under the head, including the square neck part)
• Diameter of the screw head: 17.5-18.3 mm; Height of the screw head: 4-4.5 mm; Height of the square neck: 4-4.8 mm