Thomas & Betts L70 Blackburn Mechanical Connector Brand: Thomas & Betts. Part Number: L70. Blackburn Mechanical Connector, Type L Compact, Stranded Solid Copper Conductor, 14 to 4 AWG Conductor, 9/32 in Stud, 1 Bolt Holes, 21/32 in L x 17/32 in W x 3/32 in THK Tongue, Straight Tongue, 1-Conductor, Socket, Screwdriver Slot Head Screw, Copper, 1-1/8 in L x 17/32 in W x 35/64 in H. Additional Description: TB -L70 CU 1COND 1HL MOUNT 14-4 SLOT SCREW. Catalog Description: Type L - Copper Single Conductor, One-Hole Mount, Socket, Screwdriver Slot Head Screws, Conductor Range 14 Sol-4 Str, Length 1-1/8 Inches, Width 17/32 Inch, Height 35/64 Inch..