Powerhouse Cable Protectors can be used indoors or outdoors. Constructed from TPU and PE, they are highly resistant to corrosion, oils and chemicals, and guard against impact and abrasion. Bright yellow lids offer high visibility for safety and quick recognition. Secure Lid-Lock feature for medium duty, protects pedestrian traffic by preventing trip hazards. Can withstand up to 20,000 lbs. of pressure per tire. Medium Duty Protectors feature a lower profile than Heavy Duty for smaller cables. Lid-Lock feature holds lids secure for wheeled and pedestrian traffic. Lid-Lock feature on straight style holds lids secure for lighter wheeled and pedestrian traffic. FOB Shipping Point.