Raw materials:? Rail parts, connecting rod and rivets: stainless steel. ? The end of the metal plug: zinc alloy. ? Plastic parts: nylon and glass fiber data evaluation: Function: cycle test by ultra 25,000 rpm. And to meet the requirements of BS 6375 PT.1: 2004 & PT2.1987. Corrosion resistance: comply with BS EN1670: 1998 Level 5 standard. Features:? Can provide a full range of hanging on the type and casement type window stays. ? Guarantee reliable service life. ? The tail plug compressible flexible design windows on each switch can be better sealing and solid. ? Through the BBA. ? Window stays total stacking height of 13 and 17 mm, suitable for all popular window type. ? Compressible because of its elasticity, to ensure that this window stays tight fit with sash, this design it is Anna perfect closure of the window and the frame structure can be realized.