THE 4 HOLE - WIDE SLOTTED INSIDE CORNER BRACKET IS AN EXTERNAL FASTENING METHOD THAT CREATES A 90 DEGREE CONNECTION. THERE ARE TWO ADJACENT HOLES ON EACH SIDE OF THE BRACKET. TWO OF THE ADJACENT HOLES ARE SLOTTED, ALLOWING FOR A LARGER DEGREE OF ADJUSTABILITY BETWEEN CONNECTING PROFILES. THIS BRACKET REQUIRES NO MACHINING SERVICES AND CAN PROVIDE INFINITE POSITIONING ALONG THE PROFILE T-SLOT; IT ALSO ENGAGES THE 2-DEGREE DROP-LOCK FEATURE WHEN THE ASSEMBLY BOLTS ARE TIGHTENED TO THE REQUIRED TORQUE. IT IS A FASTENING METHOD THAT CAN BE REPOSITIONED AND REUSED. THE SUGGESTED MOUNTING HARDWARE CAN BE FOUND ON THE "SUGGESTED HARDWARE" TAB. ,