PSGS 1.5-3.0 Precision Spline Bore Spur Gears UPSGS 2.0-3.0 Precision Ground Spline Bore Spur Gears PSGS 1.5-3.0 Precision Spline Bore Spur Gears UPSGS 2.0-3.0 Precision Ground Spline Bore Spur Gears UPSGS 2.0-3.0 Precision Spline Bore Spur Gears PSS PSBS PSB PSC Precision Splined Shafts+Bushings