Pair of 13mm x 12" inch Side Hung Window Stays / Friction Hinges - Designed to Stay Open in Any Position Due to Friction, for uPVC or Aluminium profiled Windows (310mm). :
Window Hinges & Friction Stays | Window Hardware
Roto PN UNI Projecting Side Hung Hinges
16" Window Friction Hinge (Side Hung) | Truly PVC - Conservatory Window Door Roofline and Building Products
Egress Easy Easi Clean 12" 16" Window Hinges UPVC Side Hung Friction S – UPVCSTORE