... maintenance tools, simple operation, Insulation to hold the pole ladder (Insulation hold stem ladder)Patent No.: ZL200620024475-5Model: FERSP (in order to ... : single column, PT, CT, coupling capacitors, GW6 type knife switch for maintenance tool overhaul, simple operation, versatility, stability, security light.Technical ... pedals: non-slip designPedals: non-slip design Insulation hold stem ladder