These door inserts are all aluminum .080″ construction to save weight and ensure strength and durability for any type of riding or racing. Direct bolt on to your RZR XP1K and RZR XP4 1000 with minimal drilling using a drill and 1/2″ drill bit. Pro Armor’s *NEW* Stealth bomber inspired design door inserts have taken off! Pro Armor door inserts are staking their claim as the most stylish, and strongest on the market. CNC bent & Laser cut for a precise fit. Hemmed edges for a refined edge and more rigid panel. Bolts directly to factory half doors to complete the full door look. Includes door seal. The stealth design adds protection and style to your RZR. Easily Installs in minutes.