Turnbutton Fastener 2 hole base 6mm set of 5 turnbuttons (5 x turnbutton section, 5 x base, 5 x special washer)

European manufactured (better than the imported chinese ones which aren't nickel plated brass)

2 hole base 6mm 

Standard Height 

6mm between the twist button and base

Overall height 18mm

Marine grade Nickel plated brass

2 holes for fastening

Distance between hole centres 22mm