Product Description:
<br />
<br />1.Inside Dia: 35mm (1.35 inch)
<br />2.With steel nut(approx 1 inch) 
<br />3.Light weight in precision
<br />4.Easy and quick installation
<br />5.Universal keymod format
<br />6.High quality aluminum alloy in durable mil-spec style black matte finish
<br />7.Weight：7"---440g         9"---506g         10'---532g    12"---585g
<br />           13.5"---687g       15"---730g     16.5"---740g
<br />8.Overall Length: 7/9/10/12/13.5/15/16.15 inch
<br />9.With tools, 2 pcs detachable picatinny
<br />10.Lower rail style with CNC procedure