edward tools drywall outside corner tool with ergosoft handle - perfect outside corner drywall finishing - single piece stainless steel sheetrock corner tool edward tools edward tools drywall outside corner tool with ergosoft handle is the ideal outside corner drywall tool for finishing your drywall corners. made of high grade stainless steel, this corner tool flexes for that perfect 90 degree finish. the ergosoft grip handle allows for more control and less hand fatigue. like all edward tools drywall products this corner tool comes with a lifetime warranty.