Grape Shears are used to separate small bunches of grapes at the table, so that you don’t have to tug them off.
The special scissors are about 6 to 7 inches (15 to 18 cm) long. The handles are much longer than the blades, so that you can insert the blades deeply into a cluster of grapes. Most of the scissor ends have blunt tips, so that they won’t puncture the fruit.
The handles on antique ones can be made of silver (sterling or plate), and are often decorated (e.g. with depictions of grape clusters and leaves.) The blades are usually steel.
More modern ones may be all stainless steel, or nickel plated.