1/4X2 3/4 Spring Pin Slotted Mechanical Zinc .042 They have a square drive

They have a square drive head that requires a 12-14 mm wrench or socket

These 6-20 x 3/8 Slotted Indented Hex Washer Self Tapping Screw Type AB Fully Threaded Zinc are designed for use in a variety of applications

These 12-24 x 1/2" Unslotted Hex Washer Head Taptite Alternative Full Thread 410 Stainless Steel Passivate Wax screws are designed for use in a variety of applications

The #3 head provides a secure grip

1/4X2 3/4 Spring Pin Slotted Mechanical Zinc .042 They have a square driveThe 1 4X2 3 4 Spring Pin Slotted Mechanical Zinc is a cylindrical pin with a slotted head and a spring loaded tip. It is made of zinc plated steel and has a diameter of 1 4 inch and a length of 2 3 4 inches. The slotted head allows for easy insertion and removal, while the spring loaded tip provides a secure fit. This pin is commonly used in mechanical applications, such as retaining gears, shafts, and other components.