Size 1 means "Spot Beam" =30 DegreeSize 2 means "Flood Beam" = 60 Degree100% Brand new and high quality!Modular Stackable Design + Latest 18W 6LED Technology New.Universal for 12V and 24V power sources.Low power consumption and long term lasting.Heavy duty aluminum alloy housing， fully IP67 waterproof and shockproof.The unique stackable modular design， unlimited installation， super compact.Application:Offroad / off-road， big vehicle， 4X4， 4WD， ATV， SUV， SUV's bumper， UTE， UTV， car， auto， truck， trailer， tractor， motorcycle， motor， boat， trains， bus， tanks，military，engineering vehicles (excavator，tree dozer， road roller， bulldozer， crane and mining truck etc.)，special vehicle(fire engine，ambulance， cars， rescue vehicle， communication vehicle，Excavator， military command vehicle) ，forkliftHeavy Duty Equipment， Marine deck lighting， Caravan awning lightingUse for Work light， Day light， fog light， driving light， working light lamps， vehicle's roof lights， vehicle's front lights， off road exterior lighting， Indoor & Outdoor uses， Construction Lighting， Garden， Backyard Lighting， Farming， campingSpecifications:Condition: brand newQuantity: 1pcMaterial:Diecast aluminum housingMounting Bracket: Stainless SteelLED Power: 27WSize: approx 11.6*4.5cm(main part)Package Included:1 x 27W 9LED Worklight1 x Bag of mounting accessories