A two-function SDS Max Hammer is a tool that is designed to carry out relatively heavy duty drilling work in concrete, brick and stone. 

Since it is an SDS Max hammer, it can accommodate a larger size drill bit than SDS Plus hammers. SDS Max drill bits are not compatible with SDS Plus drill bits, so care should be taken when ordering accessories. 

2-function SDS Max Hammers have both drilling and rotary hammer functions.