Global Industrial™ Steel Bollard Removable Plastic Cap & Chain Slot, Existing Concrete 42x5-1/2Steel Pipe Bollards for Existing Concrete Floors The heavy duty steel welded construction makes these traffic bollards ideal for protecting personnel, racking and machinery indoors or out. Topped with a removable plastic cap, bollards can be filled with concrete for reinforcement. Top features chain slots that allows steel chains (sold separately) to pass through openings and create a barrier. Base plates include 4 openings for mounting bolts (sold