The PROSPEED Corrugated PTFE Flexible Fuel Pump Hose Installing Pliers are designed to help quickly install flexible 5/16 and 3/8 fuel pump hose used commonly on installed in tank pumps like TI Auto 450s, Walbro 255s, etc. This allows installing of the hose without kinking and damaging the hose which would require it to be replaced. These are made 100% in house using US sourced 6061 aluminum with a media blasted type 2 anodized finish.