Overview Reviews Product Description 5" BACKING PLATE for 3 Jaw Chuck. This is the backing plate that COMES STANDARD in our sets. It is for 1" arbors. Product Videos Custom Field Product Reviews Write a Review Write a Review × Precision Chuck brand BACKING PLATE, 5", for 3 Jaw Chuck. 70043 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *