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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🎧 Elevate your sound setup with pro-grade speaker terminals — because your subwoofer deserves the best!

DIY READY DESIGN - Compact 50mm cutout size and easy screw installation make upgrades effortless.
CLEAR POLARITY INDICATORS - Red and black markers prevent wiring mistakes, so your sound stays flawless.
SECURE SCREW DOWN TERMINALS - Guarantees a tight, reliable connection that won’t loosen over time.
VERSATILE 2 WAY CONNECTIVITY - Supports 4mm banana plugs, spade terminals, or bare wire for ultimate flexibility.
PRECISION GOLD PLATED CONTACTS - Ensures optimal signal transfer and superior audio clarity.

This set of 2 professional 2-way speaker box terminal binding post cups is designed for DIY home and car stereo subwoofer projects. Featuring durable plastic construction with copper and gold-plated metal contacts, these terminals support 4mm banana plugs, spade terminals, or bare wire connections. The 50mm cutout size fits standard speaker boxes, while screw-down terminals and quick disconnect rear connectors ensure secure, hassle-free installation. Clear red and black polarity indicators help maintain perfect wiring for superior audio performance.

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£70.35

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Material	Plastic
Model Name	A18006
Speaker Type	Subwoofer
Special Feature	subwoofer
Recommended Uses For Product	For Home Stereo Systems, For Subwoofers
Compatible Devices	Home Stereo System
Surround Sound Channel Configuration	2.0
Item Weight	0.07 Kilograms
Is Waterproof	False
Control Method	Touch
Speaker Size	2.24 Inches
Brand Name	Facmogu
Package Dimensions	12.7 x 11.5 x 3.4 cm; 70 g
Item model number	A18006
Country of Origin	USA
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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