AIRCAT 6390 Compact Needle Scaler - 4,800 BPM, 1-1/4" Stroke - Paint & Rust Remover - Integrated Safety Features - Ergonomic - Quiet Tool wet dry vacuum extension hose This adjusts the gearing ratio

This adjusts the gearing ratio between the motor's fixed pulley and the output shaft's variable pulley

1-1/2" Drive x 3-13/16" Standard | Weight: 15

and round bastard files

it features the classic trigger release for maximum locking force and turn screw adjustment to fit work and stay adjusted for repetitive use

AIRCAT 6390 Compact Needle Scaler - 4,800 BPM, 1-1/4" Stroke - Paint & Rust Remover - Integrated Safety Features - Ergonomic - Quiet Tool wet dry vacuum extension hose This adjusts the gearing ratioThe AIRCAT 6390 compact needle scaler delivers 4,800 BPM and 1 1 4 stroke. Low weight, durable design ideal for removing rust, paint, and scale. 4,800 BPM 1 1 4 Stroke Low weight compact design Durable steel housing Best for removal of rust, paint and scale on flat or irregular surfaces