Bosch | Brushes 1617014138 Accud_Setting Ring Holes on the side of

Holes on the side of the bit allow the removal of glass dust from inside the bit

and if the wood is absorbent

Steel construction with unique mechanism that reduces operator effort by 40%

Standard wood cutting/general blade

Bosch | Brushes 1617014138 Accud_Setting Ring Holes on the side ofCarbon Brush Set 1617014138 Suitable for GBH 5400, GBH 5 38 X, GSH 38 & GBH 5 40D (Carbon motor brushes are one of the most commonly replaced power tool components. Because carbon brushes are wear items, meaning that through friction and use they will gradually wear away, they will eventually require replacement. Worn brushes are common causes of intermittent motor function, reduced electric braking, and reduced motor power. A worn out brush will