Genie Block Grip Trainer from Grip Genie. Designed to improve your pinch grip strength, to use, attach it to a loading pin and lift it off the ground. Features and specs: 

3" width (gripping surface) by 4" height

Steel

Fits any loading pin & carabiner
 

Refer to photos for condition and inclusions, item comes as shown and includes exactly what is pictured and only what is pictured. Stock photos have not been used. Smoke-free home, item will ship the following business day after the order is received. Please message with questions!