Glass Clamps are the most popular and effective way of securing glass panels to wall or baluster posts . Different shapes for variety design ideas . They also provide a contemporary look to commercial and residential properties. No need for adjustment - just tighten the screws, and you're done!. For mounting onto any flat or rounded surface. Rubber inserts will accommodate 3/8" and 1/2" (10 and 12 mm) tempered glass. These glass clamps can be used on curved, straight and spiral staircases railings as well as glass partitions panel holders.