VEVOR Torque Multiplier, 1 Inch Drive Lug Nut Wrench/Multiplier Heavy Duty Torque Multiplier Wrench Set, 1:64 6,800N.m Lug Nut Remover, Includes 4 Sockets (21-41mm) and Storage Case

Yes, it comes with a storage case. The torque multiplier set is packed in a durable plastic case for easy storage and transportation, according to the product description.

Yes, the handle is textured for better grip. The product description states it features a textured rubberized foam handle that provides extra friction when held.

The product description states it is suitable for heavy duty applications. Crafted from robust alloy steel, this torque multiplier can deliver an impressive 6,800Nm of output torque, making it ideal for tackling stubborn nuts on trucks, RVs, buses, and other heavy-duty vehicles.

I did not find any information about the material of the sockets in the product description or customer reviews.

About this Torque Multiplier, 21mm sockets are either square or hexagonal, and the ones we usually use are square. If you use hexagonal nuts, you cannot use them.