21 mm Wrenches | McMaster-Carr

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System of Measurement

Drive Size

Wrench Opening Shape

Wrench Style

Number of Pieces

Head Style

Drive Style

External 12-Point

External Spline

External Square

Sold As

Ratcheting

Square Drive Size

Material

420 Stainless Steel

Overall Length

4 1/2" to 11 7/8"

4 1/2" to 12 3/8"

Finish

Phosphate Coated

Appearance

Grade

Container Type

Fabric Roll-Up Pouch

Metal Clip Rail

Plastic Clip Rail

Plastic Roll-Up Pouch

Socket Style

Relative Length

Socket Type

Bolt Clearance Type

Socket Shape

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

RoHS

Export Control Classification Number (ECCN)

REACH

DFARS Specialty Metals

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79 Products

Fastening and Joining

Combination Wrenches

Combination Wrenches

Use the open end when tightening in cramped spaces and the box end when you need extra grip

Wrench Heads

Attach to your ratchet wrench and socket extension to turn fasteners where clearance is limited

Open-End Wrenches

Open-End Wrenches

Tighten and loosen fasteners from the top or the side

Sockets

Turn fasteners with an external drive style without slipping and damaging the drive

Socket Wrenches

Socket Wrenches

Apply torque to turn nuts, bolts, and other fasteners without rounding the heads

Box Wrenches

Grip all sides of a fastener to prevent slipping

Bit Sockets

Turn fasteners with an internal drive style without slipping and damaging the drive

L-Keys

Turn fasteners from either end and reach into tight spots

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)