Aluminum Wall Support Ladder is a non-self-supporting portable ladder that consists of two stiles and several rungs. Single or Straight Ladders can be manufactured using different materials, the rungs can be riveted, swaged, or glued and they come in various ranges. SPECIFICATIONS: Heavy Duty with High-Grade Aluminum Slip Resistant D Rungs Step Rung Distance 280mm Box Section with Size 60X25X2.5 mm Both sides High-Grade Rubber Shoe FEATURES: High-strength quality crimpled connection between rungs and slits Rungs and Slits are extruded from High-grade Aluminum sections Anti-skid D Rungs with a pitch of 280mm step difference Standard Ladder outside width 420mm. Low-height option is also available with 350mm outside width Light-weight and extremely stable Anti-skip pads made of high-quality rubber at the end of ladders to ensure safety and stability