22-piece long-arm hex key set for quickly tightening or loosening fasteners Standard (SAE inch) and metric sizes Made of heat-treated alloy steel for rugged strength Exclusive PTFE gray finish offers excellent protection against corrosion Long-arm design provides extended reach and enhanced leverage and torque; beveled ends ensure easy insertion Ball end hex keys insert into screws at an angle up to 25 degrees to easily reach around obstructions The Paramount PAR30199 Ball End Hex Key Set is made with custom steel that is 20% stronger than competitors'. Ball ends allow for angle entry up to 25 degrees. Exclusive PTFE gray finish offers excellent corrosion protection. Paramount hand tools give professionals the muscle they need to tackle even the most difficult tasks. Paramount hand tools meet or exceed ANSI specifications.