broken nosing of an riser of an granite finished stair riser and treads which have three grooves for anti slippery purpose and

adhesive adhesives anti architecture black broken building civil close construction coping damaged edge edges finished finishes granite granites groove grooves home house interior interiors maintenance mason nose noses nosing part parts piece pieces polished residential riser risers safety slip slippery small smooth stair staircase stairs step steps tread treads walk