UK Patent GB2426321. Screw thread lock ring provides sharp 'scallop' light effect. Integrated intumescent material completely seals the downlight and cut-out in the event of a fire. Tested in 30, 60 & 90 minute fire rated ceilings. Tested to BS476 Part 21. Tested to BS EN ISO 140-3:1995 & BS EN ISO 140-6:1998 (Acoustics) confirming that they maintain the ability for an internal or separating floor to provide sound insulation. These products available in an Anodised finish only. 2 Year guarantee.