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Monster Impact Swivel Extension Sockets – SAE and Metric


Have you ever pulled a transmission from under a car? Reaching those top bell-housing bolts can be a real pain. At best, you would reach for your longest extension, add your universal joint, and add your socket; then you hope to hit the bolt head just right since you can’t reach to feel for it. Even worse, you cobble several extensions together with the other bits added as well. We’ve all been there, but we don’t have to anymore! The Monster impact swivel extension sockets (model MST99777 and MST99789) are everything you need to do this job successfully. In addition, they are impact rated, so you can use your impact wrench, instead of busting knuckles.

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Monster Impact Swivel Extension Sockets Features

Monster introduced two new sets of impact swivel extension sockets. The MST99777 is the metric set that includes 11 pieces, from 9mm  to 19mm. Also available is the MST99789 in SAE form, which includes 10 pieces, from 5/16″ to 7/8″. Both sets are what Monster calls XXL, referring to the 12″ long extension and socket. These sets are made from Cro-Moly (CrMo) forged steel with a black oxide coating, hence giving them excellent strength and durability.

A pinless joint design prevents the sockets from binding, even when the technician has to navigate a precarious angle. The pinless design is also a safer choice than traditional universal joints. By incorporating a 30-degree swivel head, the Monster impact swivel extension sockets allow the technician to apply more usable torque than typical universal joint designs. Also notable, Monster includes a lifetime warranty with both impact swivel socket sets.

MMonster Impact Swivel Extension Socketsonster Impact Swivel Extension Sockets Specifications

Model: MST99777 – Metric XXL Swivel Socket Set

  • Drive Size: 3/8″
  • Length: 12″ Extension
  • Sizes: 11pc – 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, and 19mm 
  • Swivel: 30-degree pinless swivel
  • Joint Type: pinless joint design
  • Metallurgy: Cro-Moly (CrMo) forged steel
  • Coating: Black Oxide
  • Warranty: Lifetime

Model: MST99789 – SAE XXL Swivel Socket Set

  • Drive Size: 3/8″
  • Length: 12″ Extension
  • Sizes: 10pc – 5/16”, 3/8”, 7/16”, 1/2”, 9/16”, 5/8”, 11/16”, 3/4”, 13/16”, and 7/8” 
  • Swivel: 30-degree pinless swivel
  • Joint Type: pinless joint design
  • Metallurgy: Cro-Moly (CrMo) forged steel
  • Coating: Black Oxide
  • Warranty: Lifetime

Monster products are available exclusively through the mobile tool distribution channel.  Ask your local tool dealer for pricing.

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