White Polycarbonate Fixing Screw Button 40 off Conservatory Poly Sheet to Rafters 40*16

Hinged Plastic Clips Screw Cover Fold Snap Caps 

To screw through Polycarbonate sheets into Noggins, Purlins Rafters

OD 40mm

Snap  cap size 10mm

Shoulder OD 12mm *16mm height 

Hole ID 6mm

Height above material 10mm

as per pics

Additional information 

Chris

International, Scottish Highlands + Islands & Ireland please check P&P with me first