The way to achieve a harder shot is to practice with a hockey training aid that helps to build strength in your arms and wrists.  
The Sniper's Edge Hockey Stick Weight does just that, by slightly increasing the weight of your stick.
 Simply place the hockey stick weight  around the stick towards the blade, Velcro it and you’re ready to start building muscle to increase the power of your shot.
The Velcro fastening makes it extremely quick and easy to put on and take off.  This product is made of high quality materials for long lasting durability. 
Features
Easily fits on the end of any stick
Optimised to build strength while maintaining quickness
Each stick weight weighs 190 grams (6.7 ounces)
High quality material and reinforced seams, means it will last season after season
Length 18cm