Features: Outer ring:E27/E26 lamp-holder plastic fixed outer ring, products in strict accordance with European and American quality requirements production. Fire retardant plastic:Using VO grade fire retardant plastic material, temperature resistance up to 210 degrees, insulation, safety, feel smooth, impact resistance, aging resistance. Suitable for:The product is suitable for the installation of E27 and E26 plastic plug wire type and bakerwood self-locking wire type lamp holder. Wide applications: You can use them with the base threaded socket to fix the glass lampshade, let them decorate the lamps on the mirror or makeup lamp or bathroom lamp, and install a new glass wall lampshade. Easy to use:The plastic lamp shade reducer rings are easy to fit on a lamp shade, and they only took seconds. Specifications: Material:Plastic Color:Black,white Size: Inside diameter:About39 mm/1.5 inch Outside diameter:About58 mm/2.3 inch Thickness:About11.5 mm/0.5 inch Holding temperature :210 () Package Included: 12pcs x Lamp Shade CollarRings