For grooves inside blind hole.
Standard Abrasives 875503, Buff and Blend GP Mounted Flap Brush, Very Fine, 3 in x 2 in x 1/4 in, 7000122256
Dynabrade 51605 6"-8" (152 mm-203 mm) Dia. Right Angle Two-Hand Rotary Deluxe Buffer
Insize 2197, LARGE RANGE DIGITAL RADIUS GAGE, R1(4-590"/100-1500mm), R2(4-590"/100-1500mm), 697409778087
Insize 4808, WIRE GAGE, 0-36(.3249~.0050"), 6928640330155
3M 64797, Scotch-Brite EXL Unitized Mounted Point, A21 x 1/4 in 8S FIN, 3M 7010292685
Standard Abrasives 875503, Buff and Blend GP Mounted Flap Brush, Very Fine, 3 in x 2 in x 1/4 in, 7000122256
Dynabrade 51605 6"-8" (152 mm-203 mm) Dia. Right Angle Two-Hand Rotary Deluxe Buffer
Insize 2197, LARGE RANGE DIGITAL RADIUS GAGE, R1(4-590"/100-1500mm), R2(4-590"/100-1500mm), 697409778087
Insize 4808, WIRE GAGE, 0-36(.3249~.0050"), 6928640330155
3M 64797, Scotch-Brite EXL Unitized Mounted Point, A21 x 1/4 in 8S FIN, 3M 7010292685
For grooves inside blind hole.
