DIYHD 500cm Black Sliding Library Ladder Hardware Rolling Full Set Track Kit(No Ladder), Floor Roller with Brake

Material:Steel,Surface:Black;Weight capacity 300lbs

Only hardware,not including ladder;Brake bottom wheels can stop ladders from moving when you lock them

Full set hardware including:

100cm track with 2 bracket*5;

Joint in tube connector*4;

Wheel*2;

Stop*2;

End cap*2,

Floor Wheel with brake*2

The brackets were welded together with track;The length between two brackets is 19-11/16"

Gallary for reference: