This set includes 4 GU10 fire-rated recessed downlights with a brushed steel finish and IP65 rating, making them suitable for bathroom use. They are ideal for bathrooms, bedrooms, hallways, kitchens, living rooms, porches, and utility rooms, and are recommended for bathroom zones 1, 2, and 3. Each downlight measures 12.7 cm in height and 8.7 cm in diameter, with a required cutout of 7.5 cm and a minimum cavity depth of 16 cm. These downlights are fully tested for installation in 90-minute fire-rated ceilings and are compatible with LED bulbs, dimmable bulbs, and most domestic smart light bulbs. Please check bulb length against product dimensions for suitability. Requires 4 x 35W Max GU10 Halogen bulbs (not included). Class I - Earthed for safety.