The B6419 links the A632 at Bolsover to the A6135 at Renishaw in north-east Derbyshire. It was originally unclassified but gained its number in the mid-1930s.
The road starts at a sharp-angled junction on the A632 in Bolsover town centre and heads northwest, diverging gradually from that road as it climbs. At the top of the hill we bear right and continue north, with (as long as they are not blocked by housing) excellent views of the flat land to the left and also of Bolsover Castle, on another hill to the south. Leaving Bolsover behind there's a stretch of ribbon development allowing us to merge seamlessly into Shuttlewood, where we cross the B6418 at a staggered crossroads.
We now descend to enter open country proper and quickly go under the M1. After crossing a dismantled freight branch line in cutting there's a more substantial bridge over a dismantled railway (the Midland Railway's Clowne branch). We then zigzag across undulating terrain into the village of Mastin Moor, where the A619 is crossed at traffic lights. The road then continues on towards the River Rother but does not cross it, instead following it northwards into Renishaw. The road ends here at a T-junction on the A6135.