Replacement Base plate RWS036D is designed to fit the Roberts Extendable Knee Kicker 10.412 & 10.422, RWS036. These are genuine replacement parts and you should ensure you have the correct model before ordering. The base plate has rows of very sharp spikes so care must be taken when replacing this part, the old part should be disposed of carefully. Now also available for the GT2000 RWS036E select from drop down box. Please note the photo is of the GT2000 base plate.