SDS Plus drill bits have 4 grooves (2 open grooves, 2 closed)

The reason for the 4 grooves is to support the extra torque that the SDS Plus drill provides

The drill has a 10mm shank with is inserted 40MM into the tool holder (Chuck)

SDS stands for Schnell Drilling Systems or Slotted Drive System

SDS Plus Drill bits have carbide tips, sintered micro-grain carbide and cobalt, molded into a precise tip size and shape.  This combination is brazed to the flute, resulting an a very hard, durable tip

SDS plus drill bits are suitable for masonry and concrete drilling

TCT tip manufactured available from 4mm - 30mm diameter