5/16 TAMPERPROOF TORX PLUS BTP55PA | eBaydiy Tools

Austempering for improved product performance and a longer service life
Surface peening for greater durability
Lock-ring retention
Also includes a \”shot-blast\” process which relieves internal stress in the finished product for greater durability
Torx ends are formed rather than machined for a better match-up with fasteners and greater performance
Tri-Lobular Bit Retention – patented method of keeping bit secure in holder without movement