The ProVantage 4 in. Thick Series Silicone System Glass Block is designed for easy, DIY-friendly installation of glass blocks without the need for mortar. Here are some key features: * Mortar-Free Installation: Uses silicone instead of mortar, making it simpler and cleaner to install. * Components Included: The kit includes 10 wall anchors, silicone, horizontal and vertical spacers, and assembly instructions. * Versatility: Suitable for building walls, windows, showers, and other glass block projects. * Durability: Offers high durability with low maintenance and less waste. * Customization: Both horizontal and vertical spacers can be cut to fit various glass block sizes and configurations. This kit is ideal for creating beautiful glass block installations with a professional finish, even if you don't have masonry experience. Ref.: D