The TECH-LC is a HVAC service technician version of the original Model LC. A number of changes have been made to tailor the bag to accommodate HVAC service technicians? tools and work routines. The TECH-LC sports 53 pockets with ample pocket room for hand tools, a parts box(es), meter(s), a cordless impact drill and other bulkier items. 8 new small neoprene pockets have been added for drill bits and bit extensions.