In HC95 Hydraulic Rock Drill (or Hydraulic Drifter) operations, the Retainer shank 101157291 (shank ring) is a “connection anchor” between the drill’s transmission system and the shank—it wraps around the shank to prevent axial movement during high-torque rotation (critical for breaking hard rock) and ensures impact force is fully transferred to the drill bit. With over a decade in mining equipment maintenance, I’ve seen generic shank rings fail repeatedly: most use low-hardness metal that deforms or wears through in 300-400 hours, leading to shank slippage, uneven drill holes, and even damage to the shank’s outer surface (a $1,200+ replacement cost). Worse, a loose shank ring can cause the shank to dislodge mid-drilling, posing safety risks to operators and halting production.