Feature:1. High Quality Chrome Vanadium Alloy Steel: The corner device is made of high quality chrome vanadium alloy steel, which has an efficient, good grip, easy to operate, and durable.2. Ergonomic Handle: The corner device has an ergonomic ABS handle, which will not become hot when in use. Use your current impact driving force to make contact more closely while increasing the gear strength.3. Powerful Magnet: The corner device has a built in powerful magnet, which has a good clamping force and can quickly and easily replace the screwdriver bit.4. 90° Right Angle: The 90° right angle can change the direction of the corner drill bit by 90 degrees, and can tighten the screws that are difficult to tighten normally.5. Application: The corner device is suitable for all 1/4in standard hex shank drill bits, which can be connected with electric drills or hand held wrenches, and can be stretched to a narrow space that is difficult to attain to tighten screws and nuts.Specification:Item Type: Right Angle Drill AdaptorMaterial: Chrome Vanadium Alloy Steel + ABSPurpose: Corner DeviceColour: Yellow and BlueHex Handle Diameter: 1/4inUsage: Can be Used with Electric Drill or Hand Held WrenchScope of Application: Applicable to All 1/4in Standard Hex Shank Drill BitsPackage List:1 x 90 Degree Screwdriver Bit CornererQ&AQ:How do you put grease in the grease port?A:Where the tool transitions 90 degrees, there is a little raised ball on the one side...it's spring loaded. You need a pointed grease adapter, a needle but not the hypodermic needle...a chainsaw grease gun works well.Q:How do I grease this grinder? I don't see a fitting for a grease gun.A:As an air tool it gets greased with air tool oil added to the air inlet.