The Alpen SDS Max - SDS Plus Adaptor is an accessory designed to convert a SDS Max tool to be compatible with SDS Plus drill bits. Here's a breakdown of its features: SDS Max to SDS Plus Conversion: The adaptor allows you to use SDS Plus drill bits, which are generally smaller and more commonly used in lighter-duty drills, with a tool that accepts SDS Max shanks, which are typically used in heavier-duty rotary hammers. Alpen Brand: Known for producing high-quality tools and accessories, this adaptor is made to be durable and reliable, ensuring a secure fit between the tool and the drill bit. Compatibility: The adaptor fits securely into SDS Max tools, making it versatile and allowing the user to work with a wider range of drill bits without needing to purchase a new tool. This adaptor is typically used in construction, masonry, and other industrial applications where you need the flexibility to switch between SDS Max and SDS Plus bits.