The cut-out diameter is 1.96 inches.

Is the measurement if these 57mm long or 75mm long the desrciption sais 57, but the title 75

The overall face dimensions are 57mm x 57mm.

What’s the best way to attach the wires for the inside? Can you loosen the bolts and attach a ring terminal?

There are many ways to attach your wires. You can do it the way you mentioned. You can connect them by clips or you can solder them.

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🎵 Plug into perfection — upgrade your sound setup with pro-grade terminals!

PREMIUM SIGNAL TRANSFER - Gold-plated contacts minimize signal loss, delivering crystal-clear audio every time.
UNIVERSAL COMPATIBILITY - Fits 4mm banana plugs, spade terminals, or bare wire for ultimate DIY flexibility.
COMPACT DURABLE DESIGN - Precision 50mm cutout with robust plastic and copper build, perfect for home or car stereo projects.
CLEAR POLARITY INDICATORS - Red and black markings eliminate wiring guesswork, protecting your sound system.
SECURE HASSLE FREE INSTALLATION - Screw-down terminals and quick disconnect rear connectors ensure a tight, reliable connection.

This set of 2 professional 2-way speaker terminal binding post cups features gold-plated contacts and screw-down terminals for optimal signal transfer and secure connections. Designed for DIY speaker and subwoofer boxes, they support 4mm banana plugs, spade terminals, or bare wire. With clear polarity indicators and a compact 50mm cutout size, these durable connectors are ideal for home, car, or commercial audio projects.

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Item weight	0.07 Kilograms
Speaker size	2.24 Inches
Power source	Corded Electric
Manufacturer	Mo-gu
Part Number	A18006
Package Dimensions	12.7 x 11.5 x 3.4 cm; 70 g
Item model number	A18006
Size	2-way Square
Wattage	25 watts
Item Package Quantity	1
Usage	DIY speaker and subwoofer box building, home stereo systems, and potential commercial settings such as halls or hotels
Batteries included?	No
Batteries Required?	No
Item Weight	70 g

2 PCS 2 Way Speaker Box Terminal Binding Post Cup, 75mm DIY Home Car Stereo Screw Cup Connectors Subwoofer Plugs 50mm cutting size

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